class Na {
	public static void main(String[] args) 
	{
		int a=20;
			int b=20;
			boolean bo1=(++a%3==0)&&(a++%7==0);
			boolean bo2=(b++%3==0)&&(b++%7==0);
	
		System.out.println("a="+a);
		System.out.println("bo1="+bo1);
		System.out.println("b="+b);
		System.out.println("bo2="+bo2);
	}
}
